We have a Sanibel 3500RE we bought new in 2012. We have approx 20,000 miles on it now. Noticed the over flexing issue, very minor at first. After a run this spring from Houston to New York City and in between over a five month period and back to Houston by end of May the problem was pretty serious. Made a call to Sanibel and they made an appointment for us to bring it to Elkhart Indiana for repairs - at their cost. While it was there had a 6 point Levelup installed, also, MORryde IS and Hyd disc brakes installed. Spent more dollars and put a Hensley BD3 air ride fifth wheel hitch in our truck and installed onboard air to control air springs and the air hitch with reserve service air - added the tank under the frame of the truck. Sanibel picked it up and we went to Elkhart and brought it to NC. We are full timers and had to stay in a hotel while it was in for repairs. Very happy with all that was done. What a difference coming through the mountains. Love the hydraulic disc brakes - highly recommend them for large fifth wheels like ours, especially if you are full time RVrs as we are. Got the MORryde tour - great forward looking innovation going on there. Very pleased and comfortable with the repairs and upgrades.